Joint for fixing elastic tubes upon metal pipes.



IVI. A. IVIAZADE.

JOINT ToR TTxTNG ELAsTTc TUBES uPoN METAL was.

' APPLICATION FILED OCT. 28,1916. T 1 ,271,597, Patented July 9,1918.

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APPLICATION FILED OCT. 28, 1916.

Patented July 9,1918.

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'MAURICE ALEXANDRE NAZADE, 0F ARIS, FRANCE.

JOINT FOB FIXING ELASTICI TUBES UPON METAL BITES.

To all 'whom t may concer/n.'

Be it known that I, MAURICE ALEXANDRE MAzADE, -citizen of the Republic of France, residing at 15 Rue vdu Dbarcadere, Paris,

in the Republic of France, have invented new and useful Improvements in Joints for Fixing Elastic Tubes Upon Metal Pipes, of which the following is a specification.

The object of this invention is a tight joint system for attaching tubes made` of rubber or other elastic lmaterial upon pipes or nozzles in metal or other hard substance, which system consists essentially in the use of a coupler nut with rounded screw threads having on one side a conical entry, and which is first slipped freely upon the metal tube or nozzle and is then screwedvupon the rubber tube so as to compress it by means of the `screw threads in order to press it strongly upon the metal tube or nozzle an thus produce a tight joint.

The threaded portion of the coupler nut can be cylindric or conic, and the end of the rubber tube upon which the nut is screwed may be smooth or molded with a rounded thread having a larger diameter than that of the nut thread, so that a. compressionof the elast-ic substance will always take place when the nut is screwed on.

The nut device can be completed by a` safety device which prevents all unscrewing or uncoupling of the system. To increase the tightness of the joint, the inner side of the coupler nut can be shaped so as to preetween this side and the end of the rubber tube is inserted a washer of rubber or any -other compressible substanceso that when the nut is screwed up, the washer will be 40 pressed against the joint of the two tubes which are to be assembled. Lastly, it may be stated that by inserting between the coupler nut and the rubber tube a thin sheet of metal or other flexible substance, the rubber will be prevented from adhering to the nut or coupler and thus making it difficult to remove such coupler; this sheet or film can take the form of a cap which is .pressed into such a shape as to prevent any direct contact between the rubber and the metal tubes.

In the accompanying drawings, which'i are purely of an illustrative nature:

vFigure 1 shows an example of the method of carrying out this invention, with' the coupling nut in place.

Specification-of Letters Patent.

Patented July 9, 1918.

Application mea october' 2s, 191e. serial No. 128,163.

Figs. 2 and 3 show sectional views of two methods of making the coupling nut whose -threaded surfaces are respectively cylindric and conic.

Fig. 4 shows a form Aof coupling nut which 1s provided with a nut-locking device.

and applied to liquid or gas pipes.

Fig. 6 is a sectional view of the tight joint coupler having the supplementary jointti htening device above mentioned.

Fig.- shows a sectional view of a cou-v pling which is provided with the film of 'Fig'. 5 shows the coupling nut provided I w1th another design of nut-locking device sheet metal designed to prevent the rubber tube from adhering to the coupler.

Figs. 8, 9 and 10 show the dierent forms which may be given to this film or sheet.

Referring to Fig. 1, it is desired to produce a tight fitting of a tube a of rubber or other fiexible substance upon a tube b of metal or other hard material. rlhis tight fit is produced by the coupler or metal nut c which slips freely upon the tube b and has a conically flaring entrance portion 1 and a screw thread with rounded threads 2 which sink into the elastic substance of the tube a when the screwing takes place and 'thus press this substance strongly upon the central tube b so as to form a tight joint.

Fig. 2 shows a section of the same coupler' each of the segments thus produced by the slots carries on the inside a conical projection f, and at the end of the coupler there is again employed the conical entrance portion 1. After having screwed the coupler in place, if there is screwedan ordinary conic nut g upon the conically threaded portion e this will produce an elastic pressure of the segments tion c1 upon the rubber tube and at the same time the points f press into the elastic substance so that it will be impossible for of the non-threaded poran accidental uncoupling of the device to ta e place.

Fig. 5 represents piping for liquids or gas, with the two sections Z) and B joined by a rubber sleeve a the tight assemblage being carried out by means of the two couplers c according to the present invention. These couplers are combined here with a safety device which assures an absolutely fast holding and prevents any uncoupling.

`Each of the metal tubes is provided with a v rial of the coupler and penetrates into the substance of the rubber sleeve which can be provided if need be with a depression for this purpose. y

In Fig. 6 is shown an arrangement which can be adopted in order to increase the tightness of the coupling. This method consists in cutting out the inner side h of the coupler c so that it will possess a conical hollowed portion z' and between the coupler and the rubber tube a is inserted a washer y' of rubber or any other compressible substance So that upon screwing up the coupler 0,-the washer lwill be pressed against the joint between the tube a and the metal tube b so as to increase the tightness of this joint. In order to prevent any direct vcontact between -the coupler c and the rubber tube, the method shown in Fig. 7 can be employed in which a film or sheet la of metal or any other deformable substance is `used' between the coupler c and the rubber tube a.

Asshown in Fig. 8, this film orsheet :may

Itake the form of a cylinder whose diameter is the same as the outside diameter of the Arubber tube. It can also have the shape of the rubber tube, or again it can have the form of the pressed or stamped cap represented in Fig. 5. In this latter case, it will be observed in 7 that that portion of the rubber `tube a which is compressed between the parts b andv c does notl come in contact with the coupler c nor the metal tube b. -The interposition of the film or sheet- It is understood that the above describedl devices are only given as typical examples and that without departing from the spirit of the invention these devices can be modified as concerns the1r forms, material dimensions and details o' construction. It isV to be especially remarked that the screw threads on the interior of the coupler can be single or multiple. With a coupler having a conically shaped interior, these screw threads which are either sunken or raised in relief upon the cone, may run through the whole length of the cone or for a fraction of this length, and the male thread thus formed enlarges progressively at the expense of the female thread as the screw thread progresses to the apex of the cone.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a joint4 for tubing, the combination with a rigid tube, of a'vlexible tube telescoping therewitha threaded nut engaging said flexible tube and adapted to tightly clamp the same to the rigid tube, and deformable -material interposed between the rigid tube and the flexible tube and between the latter and the nut.

2. In a joint for tubing, the combination with a rigid tube, of 'a lexible tube telescoping therewith, a cap of flexible metal over the end of the flexible tube which telescopes with the rigid tube, a portion of the metal of said cap being interposed between the rigid tube and the, flexible tube and a threaded nut for clamping said flexible tube to said rigid tube.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. l MAURICE ALEXANDRE MAZADE.

Witnesses:

Louis `Mosns,

CHAs. P. PRESSLY. 

